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Derivative Instruments (Change In Our Unrealized Gain On Derivative Instruments In Accumulated OCI) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in our unrealized gain on derivative instruments in accumulated OCI      
Balance as of beginning-of-year $ 3,230    
Cumulative effect from adoption of new accounting standards (6)    
Income tax expense (benefit) 244 $ (949) $ 266
Balance as of end-of-year 407 3,230  
Unrealized Gain (Loss) on Derivative Instruments [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Balance as of beginning-of-year (29) 49 132
Cumulative effect from adoption of new accounting standards   (6)  
Change in foreign currency exchange rate adjustment 111 (137) 96
Change in DAC, VOBA, DSI and DFEL (13) 2 3
Income tax benefit (expense) (51) 38 41
Reclassification adjustment for gains (losses) included in net income (loss) 24 13 14
Associated amortization of DAC, VOBA, DSI and DFEL (2) (1) (1)
Income tax expense (benefit) (5) (4) (5)
Balance as of end-of-year 139 (29) 49
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Unrealized holding gains (losses) arising during the period 100 7 (205)
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member] | Net Investment Income [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Reclassification adjustment for gains (losses) included in net income (loss) [1] 4 4 5
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member] | Interest and Debt Expense [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Reclassification adjustment for gains (losses) included in net income (loss) [2] (7) (18) (10)
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member] | Realized Gain (Loss) [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Reclassification adjustment for gains (losses) included in net income (loss)     1
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Unrealized holding gains (losses) arising during the period 44 20 (10)
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member] | Net Investment Income [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Reclassification adjustment for gains (losses) included in net income (loss) [1] $ 27 18 11
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member] | Realized Gain (Loss) [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Reclassification adjustment for gains (losses) included in net income (loss) [3]   $ 9 $ 7
[1] The OCI offset is reported within net investment income on our Consolidated Statements of Comprehensive Income (Loss).
[2] The OCI offset is reported within interest and debt expense on our Consolidated Statements of Comprehensive Income (Loss).
[3] The OCI offset is reported within realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).